PREFACE. 



If this page chance to meet the eyes of any foreign 

 botanist wishing to exchange the plants of his own 

 country for those of Britain, the author will be happy 

 to meet his wishes on receiving a letter intimating 

 such. Foreign specimens of British species will be 

 as welcome to the author, as specimens of those which 

 are not found in Britain. 



Ditton Marsh, Surrey, Nov. 1835. 



